common/dumprmt.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994-1997
   5  *      Stelian Pop <pop@noos.fr>, 1999-2000
   6  *      Stelian Pop <pop@noos.fr> - Alcôve <www.alcove.fr>, 2000
   7  */
   8
   9 /*-
  10  * Copyright (c) 1980, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. All advertising materials mentioning features or use of this software
  22  *    must display the following acknowledgement:
  23  *      This product includes software developed by the University of
  24  *      California, Berkeley and its contributors.
  25  * 4. Neither the name of the University nor the names of its contributors
  26  *    may be used to endorse or promote products derived from this software
  27  *    without specific prior written permission.
  28  *
  29  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  30  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  31  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  32  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  33  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  34  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  35  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  36  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  37  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  38  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  39  * SUCH DAMAGE.
  40  */
  41
  42 #ifndef lint
  43 static const char rcsid[] =
  44         "$Id: dumprmt.c,v 1.15 2000/12/21 11:14:53 stelian Exp $";
  45 #endif /* not lint */
  46
  47 #include <config.h>
  48 #ifdef __linux__
  49 #include <sys/types.h>
  50 #include <linux/types.h>
  51 #endif
  52 #include <sys/param.h>
  53 #include <sys/mtio.h>
  54 #include <sys/socket.h>
  55 #include <sys/time.h>
  56 #ifdef __linux__
  57 #include <linux/ext2_fs.h>
  58 #include <bsdcompat.h>
  59 #include <signal.h>
  60 #else
  61 #ifdef sunos
  62 #include <sys/vnode.h>
  63
  64 #include <ufs/inode.h>
  65 #else
  66 #include <ufs/ufs/dinode.h>
  67 #endif
  68 #endif
  69
  70 #include <netinet/in.h>
  71 #include <netinet/in_systm.h>
  72 #include <netinet/ip.h>
  73 #include <netinet/tcp.h>
  74
  75 #include <protocols/dumprestore.h>
  76
  77 #include <ctype.h>
  78 #include <errno.h>
  79 #include <compaterr.h>
  80 #include <netdb.h>
  81 #include <pwd.h>
  82 #include <stdio.h>
  83 #ifdef __STDC__
  84 #include <stdlib.h>
  85 #include <string.h>
  86 #include <unistd.h>
  87 #endif
  88
  89 #ifdef  __linux__
  90 #include <ext2fs/ext2fs.h>
  91 #endif
  92
  93 #include "pathnames.h"
  94 #include "dump.h"
  95
  96 #define TS_CLOSED       0
  97 #define TS_OPEN         1
  98
  99 static  int rmtstate = TS_CLOSED;
 100 static  int tormtape = -1;
 101 static  int fromrmtape = -1;
 102 int rshpid = -1;
 103 static  const char *rmtpeer = 0;
 104
 105 static  int okname __P((const char *));
 106 static  int rmtcall __P((const char *, const char *));
 107 static  void rmtconnaborted __P((int));
 108 static  int rmtgetb __P((void));
 109 static  int rmtgetconn __P((void));
 110 static  void rmtgets __P((char *, size_t));
 111 static  int rmtreply __P((const char *));
 112 static  int piped_child __P((const char **command));
 113 #ifdef KERBEROS
 114 int     krcmd __P((char **, int /*u_short*/, char *, char *, int *, char *));
 115 #endif
 116
 117 static  int errfd = -1;
 118 extern  int dokerberos;
 119 extern  int ntrec;              /* blocking factor on tape */
 120 #ifndef errno
 121 extern  int errno;
 122 #endif
 123
 124 int
 125 rmthost(const char *host)
 126 {
 127         if (rmtpeer)
 128                 free((void *)rmtpeer);
 129         if ((rmtpeer = strdup(host)) == NULL)
 130                 rmtpeer = host;
 131         signal(SIGPIPE, rmtconnaborted);
 132         return rmtgetconn();
 133 }
 134
 135 static void
 136 rmtconnaborted(int signo)
 137 {
 138         msg("Lost connection to remote host.\n");
 139         if (errfd != -1) {
 140                 fd_set r;
 141                 struct timeval t;
 142
 143                 FD_ZERO(&r);
 144                 FD_SET(errfd, &r);
 145                 t.tv_sec = 0;
 146                 t.tv_usec = 0;
 147                 if (select(errfd + 1, &r, NULL, NULL, &t)) {
 148                         int i;
 149                         char buf[2048];
 150
 151                         if ((i = read(errfd, buf, sizeof(buf) - 1)) > 0) {
 152                                 buf[i] = '\0';
 153                                 msg("on %s: %s%s", rmtpeer, buf,
 154                                         buf[i - 1] == '\n' ? "" : "\n");
 155                         }
 156                 }
 157         }
 158
 159         exit(X_ABORT);
 160 }
 161
 162 static int
 163 rmtgetconn(void)
 164 {
 165         register char *cp;
 166         register const char *rmt;
 167         static struct servent *sp = NULL;
 168         static struct passwd *pwd = NULL;
 169         const char *tuser;
 170         const char *rsh;
 171         int size;
 172         int throughput;
 173         int on;
 174         char *rmtpeercopy;
 175
 176         rsh = getenv("RSH");
 177
 178         if (!rsh && sp == NULL) {
 179                 sp = getservbyname(dokerberos ? "kshell" : "shell", "tcp");
 180                 if (sp == NULL)
 181                         errx(1, "%s/tcp: unknown service",
 182                             dokerberos ? "kshell" : "shell");
 183         }
 184         if (pwd == NULL) {
 185                 pwd = getpwuid(getuid());
 186                 if (pwd == NULL)
 187                         errx(1, "who are you?");
 188         }
 189         if ((cp = strchr(rmtpeer, '@')) != NULL) {
 190                 tuser = rmtpeer;
 191                 *cp = '\0';
 192                 if (!okname(tuser))
 193                         exit(X_STARTUP);
 194                 rmtpeer = ++cp;
 195         } else
 196                 tuser = pwd->pw_name;
 197         if ((rmt = getenv("RMT")) == NULL)
 198                 rmt = _PATH_RMT;
 199         msg("");
 200
 201         if (rsh) {
 202                 const char *rshcmd[6];
 203                 rshcmd[0] = rsh;
 204                 rshcmd[1] = rmtpeer;
 205                 rshcmd[2] = "-l";
 206                 rshcmd[3] = tuser;
 207                 rshcmd[4] = rmt;
 208                 rshcmd[5] = NULL;
 209
 210                 /* Restore the uid and gid. We really don't want
 211                  * to execute whatever is put into RSH variable with
 212                  * more priviledges than needed... */
 213                 setuid(getuid());
 214                 setgid(getgid());
 215
 216                 if ((rshpid = piped_child(rshcmd)) < 0) {
 217                         msg("cannot open connection\n");
 218                         return 0;
 219                 }
 220         }
 221         else {
 222                 /* Copy rmtpeer to rmtpeercopy to ignore the
 223                    return value from rcmd. I cannot figure if
 224                    this is this a bug in rcmd or in my code... */
 225                 rmtpeercopy = (char *)rmtpeer;
 226 #ifdef KERBEROS
 227                 if (dokerberos)
 228                         tormtape = krcmd(&rmtpeercopy, sp->s_port, tuser, rmt, &errfd,
 229                                        (char *)0);
 230                 else
 231 #endif
 232                         tormtape = rcmd(&rmtpeercopy, (u_short)sp->s_port, pwd->pw_name,
 233                                       tuser, rmt, &errfd);
 234                 if (tormtape < 0) {
 235                         msg("login to %s as %s failed.\n", rmtpeer, tuser);
 236                         return 0;
 237                 }
 238                 size = ntrec * TP_BSIZE;
 239                 if (size > 60 * 1024)           /* XXX */
 240                         size = 60 * 1024;
 241                 /* Leave some space for rmt request/response protocol */
 242                 size += 2 * 1024;
 243                 while (size > TP_BSIZE &&
 244                     setsockopt(tormtape, SOL_SOCKET, SO_SNDBUF, &size, sizeof (size)) < 0)
 245                             size -= TP_BSIZE;
 246                 (void)setsockopt(tormtape, SOL_SOCKET, SO_RCVBUF, &size, sizeof (size));
 247                 throughput = IPTOS_THROUGHPUT;
 248                 if (setsockopt(tormtape, IPPROTO_IP, IP_TOS,
 249                     &throughput, sizeof(throughput)) < 0)
 250                         perror("IP_TOS:IPTOS_THROUGHPUT setsockopt");
 251                 on = 1;
 252                 if (setsockopt(tormtape, IPPROTO_TCP, TCP_NODELAY, &on, sizeof (on)) < 0)
 253                         perror("TCP_NODELAY setsockopt");
 254                 fromrmtape = tormtape;
 255         }
 256         (void)fprintf(stderr, "Connection to %s established.\n", rmtpeer);
 257         return 1;
 258 }
 259
 260 static int
 261 okname(const char *cp0)
 262 {
 263         register const char *cp;
 264         register int c;
 265
 266         for (cp = cp0; *cp; cp++) {
 267                 c = *cp;
 268                 if (!isascii(c) || !(isalnum(c) || c == '_' || c == '-')) {
 269                         warnx("invalid user name %s\n", cp0);
 270                         return (0);
 271                 }
 272         }
 273         return (1);
 274 }
 275
 276 int
 277 rmtopen(const char *tape, int mode)
 278 {
 279         char buf[MAXPATHLEN];
 280
 281         (void)snprintf(buf, sizeof (buf), "O%s\n%d\n", tape, mode);
 282         rmtstate = TS_OPEN;
 283         return (rmtcall(tape, buf));
 284 }
 285
 286 void
 287 rmtclose(void)
 288 {
 289
 290         if (rmtstate != TS_OPEN)
 291                 return;
 292         rmtcall("close", "C\n");
 293         rmtstate = TS_CLOSED;
 294 }
 295
 296 int
 297 rmtread(char *buf, size_t count)
 298 {
 299         char line[30];
 300         int n, i;
 301         ssize_t cc;
 302
 303         (void)snprintf(line, sizeof (line), "R%u\n", (unsigned)count);
 304         n = rmtcall("read", line);
 305         if (n < 0)
 306                 /* rmtcall() properly sets errno for us on errors. */
 307                 return (n);
 308         for (i = 0; i < n; i += cc) {
 309                 cc = read(fromrmtape, buf+i, n - i);
 310                 if (cc <= 0)
 311                         rmtconnaborted(0);
 312         }
 313         return (n);
 314 }
 315
 316 int
 317 rmtwrite(const char *buf, size_t count)
 318 {
 319         char line[30];
 320
 321         (void)snprintf(line, sizeof (line), "W%d\n", count);
 322         write(tormtape, line, strlen(line));
 323         write(tormtape, buf, count);
 324         return (rmtreply("write"));
 325 }
 326
 327 int
 328 rmtseek(int offset, int pos)
 329 {
 330         char line[80];
 331
 332         (void)snprintf(line, sizeof (line), "L%d\n%d\n", offset, pos);
 333         return (rmtcall("seek", line));
 334 }
 335
 336 struct  mtget mts;
 337
 338 struct mtget *
 339 rmtstatus(void)
 340 {
 341         register int i;
 342         register char *cp;
 343
 344         if (rmtstate != TS_OPEN)
 345                 return (NULL);
 346         rmtcall("status", "S\n");
 347         for (i = 0, cp = (char *)&mts; i < sizeof(mts); i++)
 348                 *cp++ = rmtgetb();
 349         return (&mts);
 350 }
 351
 352 int
 353 rmtioctl(int cmd, int count)
 354 {
 355         char buf[256];
 356
 357         if (count < 0)
 358                 return (-1);
 359         (void)snprintf(buf, sizeof (buf), "I%d\n%d\n", cmd, count);
 360         return (rmtcall("ioctl", buf));
 361 }
 362
 363 static int
 364 rmtcall(const char *cmd, const char *buf)
 365 {
 366
 367         if (write(tormtape, buf, strlen(buf)) != strlen(buf))
 368                 rmtconnaborted(0);
 369         return (rmtreply(cmd));
 370 }
 371
 372 static int
 373 rmtreply(const char *cmd)
 374 {
 375         register char *cp;
 376         char code[30], emsg[BUFSIZ];
 377
 378         rmtgets(code, sizeof (code));
 379         if (*code == 'E' || *code == 'F') {
 380                 rmtgets(emsg, sizeof (emsg));
 381                 msg("%s: %s", cmd, emsg);
 382                 errno = atoi(code + 1);
 383                 if (*code == 'F')
 384                         rmtstate = TS_CLOSED;
 385                 return (-1);
 386         }
 387         if (*code != 'A') {
 388                 /* Kill trailing newline */
 389                 cp = code + strlen(code);
 390                 if (cp > code && *--cp == '\n')
 391                         *cp = '\0';
 392
 393                 msg("Protocol to remote tape server botched (code \"%s\").\n",
 394                     code);
 395                 rmtconnaborted(0);
 396         }
 397         return (atoi(code + 1));
 398 }
 399
 400 static int
 401 rmtgetb(void)
 402 {
 403         char c;
 404
 405         if (read(fromrmtape, &c, 1) != 1)
 406                 rmtconnaborted(0);
 407         return (c);
 408 }
 409
 410 /* Get a line (guaranteed to have a trailing newline). */
 411 static void
 412 rmtgets(char *line, size_t len)
 413 {
 414         register char *cp = line;
 415
 416         while (len > 1) {
 417                 *cp = rmtgetb();
 418                 if (*cp == '\n') {
 419                         cp[1] = '\0';
 420                         return;
 421                 }
 422                 cp++;
 423                 len--;
 424         }
 425         *cp = '\0';
 426         msg("Protocol to remote tape server botched.\n");
 427         msg("(rmtgets got \"%s\").\n", line);
 428         rmtconnaborted(0);
 429 }
 430
 431 int piped_child(const char **command) {
 432         int pid;
 433         int to_child_pipe[2];
 434         int from_child_pipe[2];
 435
 436         if (pipe (to_child_pipe) < 0) {
 437                 msg ("cannot create pipe: %s\n", strerror(errno));
 438                 return -1;
 439         }
 440         if (pipe (from_child_pipe) < 0) {
 441                 msg ("cannot create pipe: %s\n", strerror(errno));
 442                 return -1;
 443         }
 444         pid = fork ();
 445         if (pid < 0) {
 446                 msg ("cannot fork: %s\n", strerror(errno));
 447                 return -1;
 448         }
 449         if (pid == 0) {
 450                 if (dup2 (to_child_pipe[0], STDIN_FILENO) < 0) {
 451                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 452                         exit(1);
 453                 }
 454                 if (close (to_child_pipe[1]) < 0) {
 455                         msg ("cannot close pipe: %s\n", strerror(errno));
 456                         exit(1);
 457                 }
 458                 if (close (from_child_pipe[0]) < 0) {
 459                         msg ("cannot close pipe: %s\n", strerror(errno));
 460                         exit(1);
 461                 }
 462                 if (dup2 (from_child_pipe[1], STDOUT_FILENO) < 0) {
 463                         msg ("cannot dup2 pipe: %s\n", strerror(errno));
 464                         exit(1);
 465                 }
 466                 setpgid(0, getpid());
 467                 execvp (command[0], (char *const *) command);
 468                 msg("cannot exec %s: %s\n", command[0], strerror(errno));
 469                 exit(1);
 470         }
 471         if (close (to_child_pipe[0]) < 0) {
 472                 msg ("cannot close pipe: %s\n", strerror(errno));
 473                 return -1;
 474         }
 475         if (close (from_child_pipe[1]) < 0) {
 476                 msg ("cannot close pipe: %s\n", strerror(errno));
 477                 return -1;
 478         }
 479         tormtape = to_child_pipe[1];
 480         fromrmtape = from_child_pipe[0];
 481         return pid;
 482 }